How to increase image size in KB
- Choose your photo or signature.
- Pick the range the form asks for (for example 20–50 KB), or type the minimum and maximum.
- If the form also gives exact dimensions, resize to them first with the Image resizer, then tick Keep the exact pixel size.
- Click the button, check the result and download the JPG.
How it reaches the range
- Quality first. The photo is saved as a JPG at the highest quality that stays under the maximum. Higher quality means a bigger file, so this alone often lifts a small photo into range.
- Pixel size next. If it's still too small at 100% quality, the photo is enlarged; if it's too big even at low quality, it's made smaller. Skipped when you keep the exact pixel size.
- Padding last. If the exact pixel size must stay and the file is still under the minimum, an invisible comment block is added inside the JPG to reach it.
The result always shows the new size in KB and in bytes, the pixel size, the quality and which step was used. Here 1 KB is 1,024 bytes, so 20 KB means 20,480 bytes.
Example: a 20–50 KB photo at 200 × 230 pixels
An exam form asks for a 200 × 230 pixel photo between 20 and 50 KB. After resizing, your photo is only 12 KB, because a plain background compresses very well. Tick Keep the exact pixel size and choose 20–50 KB: the tool first saves it at 100% quality, and if that's still under 20 KB, pads it to just over 20,480 bytes. The pixels and the look are unchanged, and the form accepts it.
Tips
- Don't aim for the exact maximum; staying a little inside the range avoids rounding differences between portals.
- Only need to make a photo smaller? The Image compressor is quicker. For PDFs, use Compress PDF to size.